US2601175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interference microscope
Assignee: Individual
•
Filing: 1948-08-03
•
Granted: 1952-06-17
•
Expires: 1968-08-03
Abstract
No abstract record available.
Inventors
- 👤 Smith Francis Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:09
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/06; G02B21/08; G02B21/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR595930A
Cited
US2045124A
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US2014688A
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GB386315A
Cited
DE636168C
Cited
US2105671A
Cited
US2128394A
Cited
US2303906A
Cited
US2427689A
Cited
US2437061A
Cited
US2516905A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-06-17 | 1955-12-17 | 1956-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-17 | 1959-12-17 | 1960-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-17 | 1963-12-17 | 1964-06-17 | $7700.00 | Window Closed / Lapsed |